Dental tool



Oct. 27 1925' DENTAL TOOL P. R. SKINNER Filed March s, 1923 M m J R. P.

a Hormel;

Patented Got. 27, 1925.

UNITED STATES PERRY R. SKINNER, 0F AMSTERDAM, NEW YORK. 1

DENTAL TOOL.

Application filed March 5, 1923. Serial No. 622,855.

T all whom it may concern: 7

Be it known that I, PERRY R. SKINNER, a citizen of the United States, residing at Amsterdam, in the county of Montgomery and State of New York, have invented certain new and useful Improvements in Dental Tools, of which the following is a specification.

This invention relates to dental tools, and it relates particularly to detachable means for securing a tool to an angle attachment for dental handpieces.

The primary object of the invention is to provide easily operated means for attaching and detaching a tool to a handpiece which shall be of such form that when a tool is secured in operative position by it the tool shall be equally sustained on all sides and thus prevent the unequal wearing of the tool or of the attaching means which would result in wabbling or loosing of the tool after extended use. A further object is to provide attaching means which, while having the desired characteristics, shall be so arranged as to 'be protected and covered in order to be insured against injury, and from presenting exposed parts liable to interfere with the ready manipulation of the handpiece to which it is applied.

The invention, having the above mentioned objects in view, consists of the attaching means having the generic and specific features of construction and relative arrangements of the parts substantially as hereinafter described and claimed.

The preferred form of embodiment of the invention is illustrated in the accompanying drawing, in which:

Figure 1 is a sectional view of an angle attachment for dental handpieces, and a tool, the attaching means being shown in position to secure the tool in position for use.

Figure 2 is a plan view of the head of an angle attachment with a tool therein, the tool-attaching means being shown by dotted lines; and

Figure 3 is a plan view of the attaching means, showing in full lines the positions of the parts when securing a tool,and in dotted lines the positions assumed by the parts when moved to release a tool.

Fig. 4: is a perspective of the tool attaching means.

In the drawing 1 represents the head of a dental handpiece in which is arranged a rotatable sleeve 2 provided with a bevel gear tended for use in connection with the hand-- piece, has a cylindrical shank of, a size to.

fit into the sleeve and is provided with a recess 7 into which extends the projection 5 of the sleeve. The end of the tool has in it a circumferential groove 8, and when the tool is introduced into the sleeve the grooved portion of the tool extends a short distance beyond the head of the handpiece.

The head 1 is provided with a covering plate 9 which may be formed integrally with the head and which covers the end of the tool when the latter is in position for. use and which also covers the tool-securing means, to be hereinafter described, when the latter is in engagement with the tool. The plate 9 is attached at one edge to the head 1 and its opposite edge is spaced from the head, thus forming a chamber for the attaching means open at one side to permit the outward movement of part of the attaching means in the act of releasing the tool. 1

In the attaching devicesheretofore generally used for securing tools of the general form described, a locking member which occupies only a portion of the circumferential roove in the tool when in engaging position is employed. Consequently an uneven or wabbling movement of the tool is permitted, and this after long use terminates in uneven wear of the parts to the extent that operative holding of the tool is rendered impossible. The construction of the retaining means employed in my device is such that when a tool is secured in position for use the tool is entirely surrounded by the retaining means which enters the circumferential groove of the tool and furnishes a secure fastening and prevents all irregular movements which would tend to uneven wear of the parts.

The securing means herein shown consists of two pivoted locking plates 10 and 11 so arranged as to be on opposite sides of the tool to be secured, and movable into and out of the groove of the tool. The plates are located beneath the covering plate 9 and are of such size that when in an engaging position they are entirely covered by the plate. The plates 10 and ii are each of a thickness corresponding to the size of the groove in the tool, and each is provided on its inner edge with a semicircular indentation 12. When the edges of the plates are in contact the indentations :torm a circular opening of a diameter corresponding to that of the center of the shank ot't' the tool which forms the central wall of the groove.

The plate 10 is pivoted on a stud 14 extending from the head 1 to allow its engaging portion to moved into or out of the groove in the tool, and the plate 11 is pivoted at a point 15 to the plate 10 for a like purpose. In order that an outward movement imparted to the plate 10 to disengage it from a tool may impart a corresponding movementto the plate 11, a pin 16 extending from the head 1 is so arranged as to project between the plates. Thus when the plate 10 is moved on its pivot to assume the position shown by dotted lines in Figure '3 of the drawing the plate 11. by reason of its connection with the plate 10 and of its contact with the pin 16. is moved oppositely to the plate 10, and in this way the tool is simultaneously freed from the attachment afforded by the two plates.

To bring the plates to a locking position, the plate 10 is moved inwardly to bring its indented portion into the groove of the tool to be secured. As this takes place the plate 11 is moved longitudinally and its outer face contacting with the portion of the head to which the covering plate is attached, this plate is forced to a position to enter the groove of the tool.

The movements of the plates are rendered convenientby providing the plate l0 with an extension 17 which constitutes a handle to be grasped during the movements. The handle is preterably resilient and has aconcave outer end of a form to fit the shank 18 of the head 1. The parts are so disposed that when the plates are in place to secure a tool the end of the handle is sprung into place to engage the shank. The handle being thus retained by frictional contact affords means for retaining the plates in securing relation with the tool during the use of the latter.

I claim:

1. Attaching means of the kind describe-d for a dental tool, comprising apivoted plate arranged on one side of a tool to be secured and a second plate pivotallv attached to the first and arranged on the opposite side or the tool, both plates being capable of swinging on their pivots to contact with or be removed from the tool.

2. Attaching means of the kind described, for a dental tool, comprising a pivoted plate arranged on one side of a tool to be secured and a second plate pivotally attached to the first, and arranged on the opposite side of the tool. the plates each being provided with an indentation for receiving the tool, and each being capable of swinging on its pivot to contact with or be removed from the tool.

the kind described comprising a pivoted plate arranged on one side of a tool to be secured, a second plate attached to the first and arranged on the opposite side of the tool, and a projection against which the second plate bears, whereby the plates are caused to move simultaneously to release a tool.

i. A dental handpiece having a head pro vided with an overhanging covering plate, tool-attaching means for a tool of the kind described comprising oppositely arranged plates movable into and out of the groove of a tool, the plates being arranged under the cover and being of a size to be entirely covered by the latter when in position to enter the groove of a tool.

In testimony whereof I afiix my signature.

PERRY R. SKINNER.

u. Attaching means form-a dental tool 0t 

